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| All Patents in class 409/261 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,315,476 | Mar. 30, 1943 | W.L. Groene | Broaching Machine | broaching machines | |
| 2,319,451 | May 18, 1943 | W.F. Groene, W.R. Meyer | Gun rifling machine | gunsmith | |
| 2,408,521 | Oct. 01, 1946 | F.J. Lapointe | Broaching machine | broaching machines | |